In electronics a NOT gate is more commonly called an inverter. The circle on the symbol is called a bubble, and is used in logic diagrams to indicate a logic negation between the external logic state and the internal logic state (1 to 0 or vice versa).
A weather watch, on the other hand, typically refers to an alert issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present.
watch glass. a curved glass piece which is used as a beaker cover or is used in evaporating very small amounts of liquid. thermometer. a glass tube containing a liquid which expands and rises in the tube as the temperature increasesâthe scale is usually marked in units of Celsius or Fahrenheit.